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SubjectRe: [PATCH v9 1/2] arch/*: Add CONFIG_ARCH_HAVE_CMPXCHG64
Hi Bart,

On Mon, May 14, 2018 at 11:46:33AM -0700, Bart Van Assche wrote:

[...]

> diff --git a/Documentation/features/locking/cmpxchg64/arch-support.txt b/Documentation/features/locking/cmpxchg64/arch-support.txt
> new file mode 100644
> index 000000000000..65b3290ce5d5
> --- /dev/null
> +++ b/Documentation/features/locking/cmpxchg64/arch-support.txt
> @@ -0,0 +1,31 @@
> +#
> +# Feature name: cmpxchg64
> +# Kconfig: ARCH_HAVE_CMPXCHG64
> +# description: arch supports the cmpxchg64() API
> +#
> + -----------------------
> + | arch |status|
> + -----------------------
> + | alpha: | ok |
> + | arc: | TODO |
> + | arm: |!thumb|
> + | arm64: | ok |
> + | c6x: | TODO |
> + | h8300: | TODO |
> + | hexagon: | TODO |
> + | ia64: | ok |
> + | m68k: | ok |
> + | microblaze: | TODO |
> + | mips: |64-bit|
> + | nios2: | TODO |
> + | openrisc: | TODO |
> + | parisc: | ok |
> + | powerpc: |64-bit|
> + | s390: | ok |
> + | sh: | TODO |
> + | sparc: | ok |
> + | um: | TODO |
> + | unicore32: | TODO |
> + | x86: | ok |
> + | xtensa: | ok |
> + -----------------------

nds32 and riscv seem to be missing from the table. I'd also suggest
sticking to the three entries documented in

Documentation/features/arch-support.txt

and using the header comment to provide any additional information.

A script that refreshes the arch support status file in place (from
the Kconfig files) is currently available in linux-next: c.f.,

Documentation/features/scripts/features-refresh.sh

Andrea

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